Organic 2 Review Problem 162

Organic 2 Review Problem 162 - 146 P RACTICAL O RGANIC C...

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146 PRACTICAL ORGANIC CHEMISTRY the terminal group. It will be seen that a methyl aldopento-furanoside (I) will give solely the dialdehyde (II), whereas a methyl aldohexo-pyranose (III) will give the dialdehyde (IV) and one equivalent of formic acid, which may be estimated. In the following examples, pinacol is oxidised to acetone, which is identified as its semicarbazone and its 2,4-dinitrophenylhydrazone, and glycerol is oxidised to formaldehyde and formic acid. The formaldehyde is readily detected by the con- densation product which it gives with "dimedone," 5,5-dimethylcyclohexan-i,3- dione (p. 277). For these experiments, prepare two solutions: (A) A solution of 2-5 g. of sodium metaperiodate in 50 mi. of water. A clear solution can be readily prepared by gentle warming, and then cooled. (B) A solution of i g. of "dimedone" (preparation, p. 277) in 10 ml. of ethanol. This solution will be required only for the glycerol oxida- tion experiment.
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